本帖最后由 fymok 于 2011-9-26 13:50 编辑
大家好，我单片机用的是stm32f103RE，64脚封装的。USART通信遇到了问题，请大家帮忙指教！
不胜感激！
上位机通过USART1向下位机发送一串十六进制数 如 AA 78 01 06 CC 33 C3 3C，
其中0xAA 0x78为一帧数据的开始，0xCC，0x33，0xC3,0x3C为一帧数据的结束，中间两个字节为要发送的数据。
程序实现的功能：下位机收到后通过USART2 向上位机返回收到的数。
遇到的问题：上位机第一次发送数据后，程序中的变量i1=8，下位机返回数据正确，上位机第二次发送数据后，单片机能进中断，但usart1接收缓存中的数据不对，并且此时i1=1，程序死机。复位后，上述问题重复。
主函数
/*******************************************************************************
* File Name : main.c
* Author : Nanjing
* Date First Issued : 22/09/2011
* Description : Main program body
*
********************************************************************************
* History:
* 09/22/2011: V0.1
********************************************************************************
* AD采样PC0口分压的值，将采样值每间隔1s向串口发送一次
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stdio.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ADC1_DR_Address ((uint32_t)0x4001244C) //0x40012400+0x4C，指的是ADC_DR
#define Tim_1ms 0x15a9 // 5545
#define Tim_10ms Tim_1ms * 10
#define Tim_1s Tim_1ms * 1000
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
uint32_t AD_value;
extern volatile uint8_t flag;
__IO uint16_t ADC1ConvertedValue = 0;
uint8_t j1 = 0 ,j2 = 0;
extern char RX_dat1[100], RX_dat2[100];
extern volatile uint8_t uart_flag1,uart_flag2;
extern volatile uint8_t t2;
uint32_t ADC_filter(void);
ErrorStatus HSEStartUpStatus;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void) ;
void GPIO_Configuration(void);
void USART_Configuration(void);
void NVIC_Configuration(void);
void Delay(vu32 nCount);
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug() ;
#endif
/* Configure the system clocks */
RCC_Configuration();
/* Configure the GPIO ports */
GPIO_Configuration();
/* Configure the EXTI */
NVIC_Configuration();
USART_Configuration();
/* DMA1 channel1 configuration ----------------------------------------------*/
DMA_DeInit(DMA1_Channel1); //开启DMA1的第一通道
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; //DMA对应的外设基地址，这个地址从Datasheet查
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC1ConvertedValue; //该参数用以定义DMA内存基地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //DMA的转换模式是SRC模式，就是从外设向内存中搬运，
DMA_InitStructure.DMA_BufferSize = 1; //DMA缓存大小，1个
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //接收一次数据后，设备地址是否后移
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable; //接收一次数据后，目标内存地址是否后移--重要概念，用来采集多个数据的
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //转换结果的数据大小
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //DMA搬运的数据尺寸，注意ADC是12位的，HalfWord就是16位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //转换模式，循环缓存模式，常用，M2M果果开启了，这个模式失效
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA优先级，高
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //M2M模式禁止，memory to memory，这里暂时用不上
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* Enable DMA1 channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADC1 configuration ------------------------------------------------------*/
ADC_DeInit(ADC1); //开启ADC1
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;//独立模式
ADC_InitStructure.ADC_ScanConvMode = DISABLE;//只是用了一个通道
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续转换模式开启
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //ADC外部触发开关，关闭
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //对齐方式，ADC结果是12位的，显然有个对齐左边还是右边的问题。一般是右对齐
ADC_InitStructure.ADC_NbrOfChannel = 1; //开启通道数，1个
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channel8 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_239Cycles5); //Configures ADC1 Channel10 as: first converted channel with an 55.5 cycles sample time
//规则组通道设置，关键函数 转换器ADC1，选择哪个通道channel，规则采样顺序，1代表规则通道第1个（1到16)，最后一个参数是转换时间，越长越准越稳定
//总转换时间=采样时间+12.5个周期=80个周期=10us
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE); //ADC命令，和DMA关联。
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE); //开启ADC1
/* Enable ADC1 reset calibaration register */
ADC_ResetCalibration(ADC1); //校准 寄存器复位
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1)); //等待校准寄存器复位完成
/* Start ADC1 calibaration */
ADC_StartCalibration(ADC1); //开始校准
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1)); //等待校准完成
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //连续转换开始，从选择开始，MCU可以不用管了，ADC将通过DMA不断刷新
while (1)
{
AD_value= ADC_filter();
Delay(Tim_1s);
if (uart_flag1 == 1)
{
uart_flag1 = 0;
for(j1=0;j1<8;j1++)
{
USART_SendData(USART2, RX_dat1[j1]);
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET); // 发送完成查询
USART_ClearFlag(USART2,USART_FLAG_TC);
Delay(5545);
}
}
}
}
void Delay(vu32 nCount)
{
for(; nCount != 0; nCount--);
}
void RCC_Configuration(void)
{
SystemInit();
#if defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || defined (STM32F10X_HD_VL)
/* ADCCLK = PCLK2/2 */
RCC_ADCCLKConfig(RCC_PCLK2_Div2);
#else
/* ADCCLK = PCLK2/4 */
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
#endif
/* Enable DMA1 clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
//必须开时钟才能 使用起来 相应IO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1|RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO|RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Output : None
* Return : None
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //选择引脚2
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //输出频率最大50MHz
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //带上拉电阻输出
GPIO_Init(GPIOE,&GPIO_InitStructure);
GPIO_ResetBits(GPIOE,GPIO_Pin_2); //将PE.2引脚设置为低电平输出
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_5; //选择引脚2 3 5
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //选择输入模式为浮空输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //输出频率最大50MHz
GPIO_Init(GPIOC,&GPIO_InitStructure); //设置PC.2/PC.3/PC.5
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure PC0 (ADC Channel10, ) as analog inputs */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure PA2、PA9 as USART1 Tx*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9| GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //输出频率最大50MHz
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure PA3、 PA10 as USART1 Rx*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10| GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures the NVIC
* Input : None
* Output : None
* Return : None
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //选择中断分组2
NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQChannel; //选择中断通道2
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占式中断优先级设置为0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应式中断优先级设置为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能中断
NVIC_Init(&NVIC_InitStructure);
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
NVIC_SetVectorTable(NVIC_VectTab_RAM,0x0);
#else
NVIC_SetVectorTable(NVIC_VectTab_FLASH,0x0);
#endif
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*******************************************************************************
* Function Name : USART_Configuration
* Description : Configures the USART1.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
// USART_ClockInitTypeDef USART_ClockInitStructure;
/* USART1 configuration ----------------------------------------------------*/
/* USART1 configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Receive and transmit enabled
- Hardware flow control disabled (RTS and CTS signals)
*/
USART_InitStructure.USART_BaudRate =115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
// USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
// USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
// USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
// USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_Init(USART1, &USART_InitStructure);
USART_Init(USART2, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开接收中断
USART_Init(USART2, &USART_InitStructure);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); //开接收中断
/* Enable USART1,2 */
USART_Cmd(USART1, ENABLE);
USART_Cmd(USART2, ENABLE);
}
//16ms finish a ADC detection
// return mv
uint32_t ADC_filter(void)
{
unsigned int result=0;
unsigned char m;
for(m=16;m>0;m--)
{
Delay(Tim_1ms);
//n=ADC_GetConversionValue(ADC1);
result += ADC_GetConversionValue(ADC1); //返回最近一次ADCx规则组的转换结果Returns the ADC1 Master data value of the last converted channel
}
return (uint32_t)(((unsigned long)(result>>4))*3300>>12); // result/16 * 3300/12
}
#ifdef DEBUG
/*描述：当程序出错时，返回出错的文件名及在源程序中的行号
输入：—file：指向文件名的指针
—line：在源程序中的行号
输出：无
返回：无
*/
void assert_failed(u8*file,u32 line)
{
while(1) {}
}
#endif
中断函数
其中0xAA 0x78为一帧数据的开始，0xCC，0x33，0xC3,0x3C为一帧数据的结束，中间还有两个字节。
void USART1_IRQHandler(void)
{
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //检查相应的中断发生没
{
RX_dat1[i1++] = USART_ReceiveData(USART1);
if((RX_dat1[0]==0xAA)&&(RX_dat1[1]==0x78)&&(RX_dat1[4]==0xCC)&&(RX_dat1[5]==0x33)&&(RX_dat1[6]==0xC3)&&(RX_dat1[7]==0x3C))
{
i1=0;
uart_flag1 = 1;
}
USART_ClearITPendingBit(USART1, USART_IT_RXNE); //清除相应的中断标志位
}
}
|
|
楼主
标题置顶
标题高亮
